Malahit ATU-100 Antenna Tuner Kit
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The Malahit ATU-100 is a DIY automatic antenna tuner kit based on the popular open-source N7DDC 7x7 design, covering 1.8 to 50 MHz with a compact OLED display for real-time feedback. The SMT components and microcontroller come pre-soldered with firmware already programmed, reducing the assembly complexity to through-hole components and final wiring. It strikes a solid balance between hands-on building experience and beginner accessibility, making it a rewarding project for amateur radio enthusiasts on a budget.
Key Features & Specs
| Frequency Range | 1.8 to 50 MHz, covering HF and 6-meter bands |
|---|---|
| Display | 0.96 inch OLED screen showing SWR, power, and tuning status in real time |
| Assembly State | Partially assembled kit with SMT components and microcontroller chip pre-soldered; through-hole soldering required by the builder |
| Firmware | Version 3.2 pre-programmed on the microcontroller, based on the open-source N7DDC 7x7 design |
| Tuner Design | 7x7 L-network topology with automatic relay-switched inductors and capacitors for fast impedance matching |
| Power | Powered via external DC supply, typically 8 to 15V; low standby current draw |
| Compatibility | Suitable for use with most HF transceivers supporting a standard antenna tuner interface or manual tune activation |
Best for: This kit is best for amateur radio hobbyists and ham operators with basic soldering skills who want an affordable, capable automatic antenna tuner and enjoy the satisfaction of building their own station equipment.